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首页> 外文期刊>ACS applied materials & interfaces >Unidirectional Fast Growth and Forced Jumping of Stretched Droplets on Nanostructured Microporous Surfaces
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Unidirectional Fast Growth and Forced Jumping of Stretched Droplets on Nanostructured Microporous Surfaces

机译：纳米结构微孔表面上拉伸液滴的单向快速生长和强迫跳跃

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摘要

Superhydrophobic nanostructured surfaces have demonstrated outstanding capability in energy and water applications by promoting dropwise condensation, where fast droplet growth and efficient condensate removal are two key parameters. However, these parameters remain contradictory. Although efficient droplet removal is easily obtained through coalescence jumping on uniform superhydrophobic surfaces, simultaneously achieving fast droplet growth is still challenging. Also, on such surfaces droplets can grow to larger sizes without restriction if there is no coalescence. In this work, we show that superhydrophobic nanostructured microporous surfaces can manipulate the droplet growth and jumping. Microporous surface morphology effectively enhances the growth of droplets in pores owing to large solid-liquid contact area. At low supersaturations, the upward growth rate (1-1.5 mu m/s) of these droplets in pores is observed to be around 15-25 times that of the droplets outside the pores. Meanwhile, their top curvature radius increases relatively slowly (similar to 0.25 mu m/s) due to pore confinement, which results in a highly stretched droplet surface. We also observed forced jumping of stretched droplets in pores either through coalescence with spherical droplets outside pores or through self-puffing without coalescence. Both experimental observation and theoretical modeling reveal that excess surface free energy stored in the stretched droplet surface and micropore confinement are responsible for this pore-scale-forced jumping. These findings reveal the insightful physics of stretched droplet dynamics and offer guidelines for the design and fabrication of novel super-repellent surfaces with microporous morphology.
机译：超疏水纳米结构表面通过促进逐滴冷凝而表现出在能源和水应用中的出色能力，其中滴的快速生长和有效的冷凝水去除是两个关键参数。但是，这些参数仍然是矛盾的。尽管通过在均匀的超疏水性表面上的聚结跃迁很容易获得有效的液滴去除，但是同时实现快速的液滴生长仍然具有挑战性。同样，如果没有聚结，液滴可以在此类表面上生长成更大的尺寸而不受限制。在这项工作中，我们表明超疏水纳米结构的微孔表面可以操纵液滴的生长和跳跃。由于大的固液接触面积，微孔表面形态有效地促进了液滴在孔中的生长。在低过饱和度下，观察到这些液滴在孔中的向上生长速率（1-1.5μm / s）约为孔外液滴的15-25倍。同时，由于孔隙的限制，它们的顶部曲率半径相对缓慢地增加（类似于0.25μm / s），这导致液滴表面高度拉伸。我们还观察到通过与孔隙外部的球形液滴聚结或通过不结合的自膨化而在孔隙中强迫液滴飞跃的现象。实验观察和理论模型均表明，储存在拉伸液滴表面和微孔限制中的过量表面自由能是这种孔隙尺度强迫跳跃的原因。这些发现揭示了拉伸液滴动力学的深刻见解，并为具有微孔形态的新型超疏水表面的设计和制造提供了指导。

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